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Mayday!! Mayday!! - Japanese Logo - Katakana / Kanji

Mayday!! - Cabinet - Video Game Marquee


The player's ship flies over a horizontally scrolling planet surface. Waves of enemy ships attack and must be destroyed for the player to advance to the next planet. The Mayday button slows the game down for five seconds. The player's ship fires both forward and back.

Mayday!! was produced by Hoei in 1981.

Hoei released 5 machines in our database under this trade name, starting in 1980. Hoei was based in United States.

Other machines made by Hoei during the time period Mayday!! was produced include: Space Bird, Final Ranger, Future Flash, and Super Meteor


Name Mayday!!
Developer Hoei (United States)
Year 1981
Type Videogame
KLOV/MOG # 8646
Class Wide Release
Genre Space
Conversion Class unique
# Simultaneous Players 1
# Maximum Players 2
Game Play Alternating
Control Panel Layout Single Player
  • Joystick: 8-way
  • Buttons: 3 - Fire Forward|Fire Back|Mayday
Sound Amplified Mono (one channel)
Cabinet Styles
  • Upright/Standard
Bezel Mayday!! Bezel Image
Control Panel Mayday!! Control Panel Image
PCB Mayday!! PCB Image

Game Play

The game itself is not a direct copy of Defender. It has an 8-Way joystick, two fire buttons (forward and backwards) and a Mayday button. The Mayday button slows everything on-screen down for a few seconds and makes the screen flash. Although it only scrolls from right to left, you can speed up and slow down your ship's forward momentum. The first wave that is over the sea of submarines. The submarines, which look a lot like Baiters in Defender, shoot along the bottom of the screen and fire up at the player's ship. The player's shots are aimed diagonally down at the waves. The second wave is flying through a cavern with swarms of aliens flying and bouncing from right to left towards the player. Unlike Defender, you can crash into the cavern walls. The third wave is set over a gently rolling planet surface. Later waves follow a similar pattern.

Mayday!! KLOV/IAM 5 Point User Score: 0.00 (0 votes)

Personal Impressions and Technical Impressions each account for half of the total score. Within the Personal Impressions category, Like carries a little more weight than the other factors.

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More pictures


Williams considered this game to be an "infringement" on their copyright of Defender which led to the halting of Mayday!!'s production.


COPY OF: Defender

VAPS Arcade/Coin-Op Mayday!! Census

There are 14,848 members of the Video Arcade Preservation Society / Vintage Arcade Preservation Society, 9,512 whom participate in our arcade census project of games owned, wanted, or for sale. Census data currently includes 164,983 machines (6,922 unique titles).

Uncommon - There are 8 known instances of this machine owned by Mayday!! collectors who are active members. Of these, 3 of them are original dedicated machines. 5 of them are only circuit boards which a collector could put into a generic case if desired.

For Sale - There is one active VAPS member with an extra Mayday!! circuit board for sale.

Wanted - No active members have added this machine to their wish list.

This game ranks a 2 on a scale out of 100 (100 = most often seen, 1=least common) in popularity based on census ownership records.

Rarity and Popularity independently are not necessarily indications of value. [More Information]


The board set for is a slightly altered Defender boardset. The game will almost run with a straight ROM swap.


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